hi guys,

i'm new to planted aquarium.
still loafs to learn from all your guru..

but i have a few question about the measurement and ph pen.

1.) which brand of ph pen consider "ok"? as in not spolit easily ? price?
2.) other than PH/KH what else you guys measure for planted tank ? can explain why measure them ? and roughtly what's the most suitable reading for them ? i have a 3 ft tank... with holland sand+amazonia.

if you got PH pen wanna sell, can pm me ?

cheers..